Plate shaving machine



Dec.`l5, 1936. W, J LOFSTEDT 2,064,172

PLATE SHAVING MACHINE f1 141s q; TTUR/VEV W. J. LOFSTEDT PLATE sHAvING MACHINE Filed Sept. l, 1934 Dec. 15, 1936.

2 sheets-sheet 2 Jj 62 47 o l lo 52 6 1'/ x o y i fig. (f3.

wvl/EN TU w. J. Lo FSTEDT Patented Dec. 15, 1936 UNITED STATES PATENT OFFICE PLATE Sl-IAVING MACHINE Portland, Oregon Application September 1, 1934, Serial No. 742,378

8 Claims.

'This invention relates generally to the printers art, and particularly to a machine for shaving plates.'

'I'he main object of this invention is the provision of a simplied form of plate shaving machine which will quickly and accurately reduce the thickness of a plate to a desired dimension.

The second object is to utilize a helical high speed steel cutter with continuous knives which are guttered to throw the chips into a receptacle, the knives having a helical angle adapted to move the chips laterally toward a point of discharge.

The third object is the provision of a special form of cutter which will render unnecessary the l5 usual form of hold-down clamps commonly employed on shaving machines.

'I'he fourth object is the use of a spring vibration absorbing composition roller.

The fth object is the provision of an oil jet pipe for supplying an oil vapor to the cutter knives.

The sixth object is to so mount the plate upon the bed that it is urged in a diagonal direction against a pair of stops, requiring only flexible spring-hold downs which engage the plate as it passes through the machine.

The seventh object is to provide an automatic cut-out which will limit the depth of a cut which can be made at a single operation.

The eighth object is to provide an indicator dial having micrometer readings in the various systems of measurementthat is, in decimal fractions of an inch of the metric system or in printers measure with accented markings for standard thickness of electros, 11 points, stero base, electro base, zinc base and type-high.

I'he ninth object is to provide a forwarding and reversing bed lever by means of which the bed is moved in either direction, and additional means is provided for automatically stopping the bed at either limit of travel.

The tenth object is to provide a hand wheel for the complete forward or backward movement of the bed for use on small work when the full return 45 stroke of the bed is not necessary.

These, and other objects, become more apparent from the specication following as illustrated in the accompanying drawings, in which:

Fig. l is a vertical section taken along the line I-I in Fig. 2.

Fig. 2 is a horizontal section taken along the line 2-2 in Fig. 1.

Fig. 3 is a vertical section taken along the line 55 3-3 in Fig. 1.

(Cl. Sil-18) Fig. 4 is an enlarged detail of the oil spraypipe.

Fig. 5 is a rear elevation of the machine.

Fig. 6 is a. section taken along the line 6-6 in Fig. 5.

Fig. 7 is a section through the felt roller bear- 5 ing.

Fig. 8 is a vertical section through an alternative form of the device showing the screw conveyor for removing the chips.

Similar numbers of reference refer to similar 10 parts throughout the several views.

Referring in detail to the drawings, there is shown a pedestal I0 upon whose base II is formed a dove tailed guide I2 which extends along the length of the base II. Journaling in the base II 15 is a horizontal shaft I3 near the middle of which is secured a. pinion I 4, and on the outer end of which is secured a hand wheel I5.

On the guide I2 is mounted a slide I5. .Within the slide I6`is mounted the slidable wedge I1 20 through whose up-standing portion I8 is secured the threaded end I9 of the bed plate elevating screw 20 whose opposite end 2| journals in the slide I6. The screw 28 is provided with a hand wheel 22 by means of which the position of the 25 wedge II can be adjusted. The wedge I'l is held in position by means of the plates 23.

Resting on the wedge I'I are the inclined ribs 24 which are formed on the under side of the bed plate 25, upon which rests the electro-type plate 3 or its equivalent 26.

The bed plate 25 lies within an opening 21 formed in the top 28 of the slide I6. End stops 29 and side stops 30 are secured on the upper side of the top 28 around the opening 21.

An indicating gage 3| is mounted in the top 28 adjacent to the hand wheel 22. The lever 32 is pivoted on the support 33 which depends from thev under side of the top 28. One end of the 4 lever 32 is connected to the gage 3I and the other end thereof is connected to the bed plate 25, aiording thereby a means for indicating the elevation of the bed plate 25, or rather the dimension of the shaved base after it passesunder the 45 cutter.

One the base I I are formed the upright supports 34, across the upper ends of which journals the cutter shaft 35 in the anti-friction bearings 36. The cutter 31, which is secured on the shaft 35, is 5 distinguished from the ordinary milling cutter by its greater helix angle, the purpose of which is to throw the chips laterally into the trough 38 from whence they can nd their way into the outlet chute 39 and into the receptacle 40. A hood 4I is disposed over the cutter 31,

Between the trough 38 and the cutter 31 is formed an inclined lplate 42 which deflects the chips and guides them into the trough 38. 0pposite the plate 42 and joined to the hood 4I is a plate 43. On the under side of the hood 4I and above the plate 143 is' an oil spray pipe 44 provided with very small outlet holes y45 through which an oil vapor is forced upon the cutter 31 toward the shaving operation. Rotation is supplied to the cutter 31 by means of the belt 46 and pulleys 41 and 48 from the motor 49.

A gear pump 58 is driven by the belt 5I through the pulleys 52 and 53, the latter of which is secured on the shaft 35. The pump 50 supplies oil from the well 54 through the pipe 55 to the oil spray pipe 44.

On the under side of the slide I6 is formed a rack 56 which meshes with the pinion I4. On the under side of the plate 43 and journaling in the supports 34 is a shaft 51 which carries a felt roller 58, the purpose of which is to dampen vibrations which may occur in the electro-type plate 26 being shaved.

Underneath the plate 42 is the horizontal shaft 59 on which are rockably mounted a plurality of spring-urged chip deflector arms 60 whose lower ends yieldably engage the shaved surface of the plate 26.

Underneath the trough 38 is a trip arm 6I which is mounted on the rock shaft 62 and, through the levers 63, 64k and 65 and the connecting rods 66 and 61, are utilized to actuate a jaw clutch 68 which is interposed between the worm drive 69 for the shaft I3, and the bevel gear 18 which is driven from the pinion 1I which, in turn. is driven by the pulley 52. The pulley 52 (as shown in Fig. 6) also drives the gear 12 which drives the gear pump 50.

'Ihe lower end of the trip arm 6| is set at a predetermined distance above the lowermost edge of the cutter 31. For example, if it is determined that the maximum cut to be taken at a single operation is one hundred and twenty-five thousandths, this represents the distance between the bottom of the trip 6I and the bottom of the cutter 31, so that if an attempt is made to take a heavier cut-that is, feeding a plate of a thickness which will engage the trip 6I, the jaw 68 will be withdrawn and the feed through the pinion I4 stopped.

It is desirable to make the trough 38 hinged, permitting it to assume the position shown in dotted lines in Fig. 3, toexpedite the removal of chips therefrom and to give access to the cutter 31, andother parts.

While the pump 58 is driven continuously` in one direction it is of course desirable to rotate the shaft I3 in either direction. This is accomplished by interposing Ithe reversing clutch jaw 13 which is splined on the shaft 14 and can be brought into a driving relationship with either of the gears 18 or 12 by means of the bell crank lever 15 which is urged to either of its extreme l positions by means of the spring-urged plunger 16. The bell crank lever 15 is operated by a conl'necting rod 11 from the`bell crank lever 18.

To the slide I6 is adjustablyattached the trip arm 19. A corresponding trip arm 88 is disposed at the opposite end of the slide I6. Either of the trip arms 19 or 80, by engaging the bell crank lever 18, can move the plunger 16 to the central notch 8| of a stationary incline block 82 which will bring the feed mechanism to a rest, where it will remain until it is reversed manually by moving the lever 18.

In Fig. '1 is illustrated the relation between the bed plate 25, electro-type plate 26 and the felt roller 58. It will be noted that the roller 58 journais in the slidable bearings 83'which are confined within the slots 84 formed in the extensions,

wheel 22 is irst rotated until the gage 3l indicates the desired reading-that is, the thickness to which the plate is to be nished. The plate is then placed against one of the lateral stops 38 and an end stop 29 and the lever 18 operated, causing the cutter 31 to be rotated at a high rate of speed while the plate 26 is advanced under the cutter and reduced to the desired thicknessv at one operation, leaving a smooth clean cut.

The angle of the cutter blades is such that the rapidly moving chips are deflected laterally toward the chute 39, the cutting action being greatly improved by the presence of the oil vapor which continually surrounds the cutter.

When the plate 26 is moved entirely past the.

cutter 31 the lever 18 engages the trip 19 and the entire machine comes to rest, and in order for the bed to be returned to its starting position the lever 18 must be operated manually, as previously stated.

It will be observed that no hold-down arrangements of any kind, or clamps are necessary in connection with the use of this device other than the yieldable arms 60 and the vibration absorbing felt roller58.

The net result of the use of this machine is a great4 saving -in labor and the production of a precisely nished product.

It will be noted that the action of the cutter itself tends'to hold the plate upon the bed and the stops 29 and 30 alone prevent the movement of the plate 26 with relation to the bed plate 25. I claim:

1. A plate shaving machine having in combination a vertically adjustable, horizontally slidable bed plate, an elongated cutter having continuous spiral blades formed thereon mounted over said bed plate, stops along one edge and one end of said bed plate and a vibration absorbing roller vadapted to engage the nished surface of an electro-type plate as it emerges from said cutter.

2. A plate shaving machine consisting of a horizontal slide having a vertically adjustable bed plate mounted thereon, side and end stops mounted alongside of said bed plate, va cutter disposed over said bed plate, and a trip disposed in front of said cutter having operating connections to the cutter drive whereby an electro-type of. excessive thickness will engage said trip before it can reach said cutter thereby stopping the operation of the machine.

3. A plate shaving machine as described in claim 2 in which the cutter is partially enclosed by a hood in which is disposed an oil spray pipe and a trough disposed alongside of said cutter A 2,064,172' Vsaid trough having a hinged support at one end to facilitate the dumping of chips therefrom.

4; A plate shaving machine having in comblnation a horizontal slide, a bed plate vertically adjustable upon said slide, a driving means for moving said slide .from one end of its travel to the other, manual means for reversing the movement of. said slide, an elongated cutter mounted over said bed plate, yieldable fingers beneath which an electrotype plate must pass before engaging said cutter and avibration absorbing roller yieldably mounted over said bed plate and adapted to ride upon the surface of said electrotype plate after it has been finished by said cutter.

5. A plate shaving machine having -in combination a rotary spiral cutter having continuous flutes, a. slide on the under side of said cutter having side and end stops xedthereon, a bed plate'vertically adjustable between said side and end stops, a trip arm mounted over said side stops adapted to be actuated by an object of excessive thickness and means for 'moving said slide under the control of-said trip arm whereby a movement of said trip arm by an object of excessive thicknesswill cause 'a stoppage in the movement of said slide.

A-6. A plate shaving machine having an elongated continuous spiral cutter, a bed plate disposed beneath said cutter and adjustable with relation thereto, side and end stops for said bed plate which are independent of said vertical adjustment, means for sliding said bed plate together with said side and end stops under said cutterand a vibration absorbing roller adapted to urge the nished electrotype plate against the bed plate as it emerges from beneath said cutter. '7.'In a plate shaving machine, an elongated spiral cutter, a slide beneath the cutter, side and end stops movable with the slide, a support for the plates to be shaved, means for increasing and decreasing at will the distance between the cutter and the plate support so as to determine the depth of cut, and means for sliding as a unit,

i .the slide, the stops, the support and the plates thereon.

WILLIAM J LOFSTEDT. 

